The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 1978
Filed:
Jun. 04, 1975
Siegfried Godel, Norwalk, CT (US);
Albert Adam Pudims, Stratford, CT (US);
Richard Wergzyn, Bridgeport, CT (US);
Sperry Rand Corporation, Bridgeport, CT (US);
Abstract
An airstream is established and flows about a resistance heater element in an electrical appliance. The heater element is energized by a cyclical potential. A temperature control circuit is provided which includes a switch connected in series with a heat sensor for applying the cyclical potential to the heater. A half-wave rectifier in the control circuit is electrically connected in series with the switch and across the heat sensor. Energization of the heater heats the airstream to an operating temperature T.sub.1. The heat sensor is operable to detect an undesired increase in temperature above a safe limit temperature T.sub.2 which is greater than T.sub.1. At a temperature greater than T.sub.2 the heat sensor automatically opens the series circuit to interrupt energization of the heater. During the open circuit condition of the heat sensor the half-wave rectifier is operable for applying half-cycles of the cyclical potential to the heater. The half-cycle energization of the heater heats the airstream at a reduced operating temperature T.sub.0 which is less than the operating temperature T.sub.1.